Jetty setting



y 1941- G. w. REHFELDD JETTY SETTING Filed April 24. 1939 INVENTOR eorge Re/zfe/d ATO'RNEY 1 Patented July 8, 1941 JE'ITY SETTING George W. Rehfeld, Manhattan, Kans. Application April 24, 1939, Serial No. 269,667

3 Claims.

This invention relates to jetties particularly those formed of standard structural members, and has for its principal object to provide a jetty of this character having a greater spread and stability for a given weight and length of the structural members.

A further object of the invention is to provide an improved line setting of the jetties whereby a greater length of jetty is obtained without reducing the effectiveness thereof.

Other objects of the invention are to provide a jetty construction which permits higher points of attachment of the anchoring rods; and to provide flexible means for interconnecting the similar members of adjacent jetties to further maintain stability of the setting arrangement.

In accomplishing these and other objects of the invention, I have provided improved details of structure, the preferred form of which is illustrated in the accompanying drawing, wherein:

Fig. 1 is a perspective view of a portion of a line of jetties embodying the features of the present invention.

Fig. 2 is a plan view of the jetties illustrated in Fig. 1.

Fig. 3 is an enlarged detail perspective view showing the coupling between the connected members of the adjacent jetties.

Referring more in detail to the drawing:

I and 2 designate adjacent jetties in a line setting such as used in controlling the banks of streams and the like. The jetties illustrated are of the same construction and formed of structural members, for example, angle-irons. Cost of structural shapes are graduated upon a basic size. As the sizes vary on the respective sides of the base, the costs increase. It is, therefore, highly desirable in the designing of structural forms that the base size be used in order to reduce the cost per weight of the finished project. However, to take advantage of the lower price it is necessary to design the project so that the basic size members may be used without increasing the total weight or reducing strength and stability thereof.

In carrying out my invention, I have found that basic sized angles may be well adapted to jetty construction providing the members be arranged to maintain maximum spread with greater spacing, providing that the terminals of the structural members effectively narrow the gaps at the top and/or bottom portions of adjacent jetties to afford the same effective obstructions in retarding flow of water and stoppage of debris carried thereby. Since the basic angle has greater Width flanges than usually used in jetty construction, the, angles may be of greater length and yet afford the same strength of construction. Longer length angles also provide a greater stability due to the wide leg spread and the greater height at which the anchoring cables or rods may be secured.

The angle members 3, 4 and 5 which constitute the legs of the jetty are arranged in the form of a tripod so that the lower ends 6, l and 8 thereof are adapted to engage the bed of a stream and provide a tri-point support which, as is well known, is a most stable form of setting. The angle members 3, i and 5 are crossed at a point slightly above the centers thereof and are secured at the crossing points by fastening devices, such as bolts 9, extending through the respective flanges of the angles. The upper terminal ends, above the crossing points, provide diverging arms til, it and I2 having almost the same extent of spread as the leg portions so that the arms afford maximum obstruction when the jetties are placed together and substantially close the spaces at the upper and lower portions of the jetty line.

Cooperating with the structural members just described are substantially horizontally arranged angle members l3, l4 and it which are intercrossed in the form of an isosceles triangle, the member l3 being connected with the angles 4 and 5 by fastening devices, such as bolts l6, extending through the adjacent flanges at points spaced substantially corresponding distances below the center of the structural members. The member M is connected in similar manner to the angles 3 and 4 and the member l5 to the angles 3 and 5. The terminal ends ll therefore provide projecting arms complementary to the upper portions 3, i and 5.

The arms of the structure members thus described are interconnected by suitable lacing, such as rods and/orwire l8,which extend through suitable openings l9 formed in the flanges of the respective members, as in conventional practice.

In setting the jetties they are located in the desired linear direction relatively to the bank to be protected with the leg portions 6, I and 8 resting on the river bed and with one of the horizontal members of each jetty, for instance those designated l3, preferably located in end to end normally approximately alignment with each other. The ends of the members It are then connected by means of a preferably flexible connection in the form of a rod 213 having ends extending through openings 2| of the members, looped around the adjacent flanges, as at 22, and hooked over the body portion of the rod as at 23. The rods are of suificient length to allow for predetermined play between the respective jetties so that they may yield independently of each other in adjusting themselves to the force of the current and the pressure of the debris acting thereon.

The jetties are further ordinarily connected together by anchoring cables or rods 24 and 25 which may be secured to a suitable dead man (not shown), that is buried in the bank, in such a manner that one of the lines of rods preferably extends through the crotch formed by the arms above the fastening devices 9, and the other rod extending through a crotch of the pair of adjacent tripod members at a point below the fasten ing devices, as clearly shown in Fig. 1. The rods are then clamped together on the down-stream side by suitable clamps or other fastening devices as indicated at 26.

With this anchorage arrangement the cables are attached to the jetties above their horizontal centers so as to provide more stable support thereof and to resist shifting under force of the current acting thereon. The connections for the horizontal members l3 cooperate with the cables or rods to further stabilize the jetties.

When the jetties are thus constructed and set, they provide a greater length for a given weight of material, are of more stable construction, and better capable of withstanding the thrusts acting thereagainst.

What I claim and desire to secure by Letters Patent is:

1. A jetty setting of the character described,

including a. plurality of jetties each composed of bars arranged in tripod form and connected together, transverse bars arranged in substantially triangular formation and connecting the tripod bars, said jet'ties each having one of its transverse bars arranged in end-to-end initially approximate alignment, the ends of the aligned transverse bars being sufiiciently close to each other to form substantially a continuous metallic structure throughout the jetty setting, flexible means connecting the end of said aligned bars, and an anchoring line connecting the jetties and extending throughout the entire length of the jetty setting in substantial parallelism with the aligned transverse bars and cooperating with the same to form two continuous longitudinal debris holding members extending the entire length of the jetty setting.

2. A jetty setting of the character described, including a plurality of jetties each composed of bars arranged in tripod form and connected to gether, transverse bars arranged in substantially triangular formation and connecting the tripod bars, said jetties each having one of its transverse bars arranged in end-to-end initially approximate alignment, the ends of the aligned trans verse bars being sufiiciently close to each other to form substantially a continuous metallic structure throughout the jetty setting, and coupling means consisting of a bowed flexible connection member secured at its ends to the adjacent ends of the aligned transverse bars and connecting same and permitting a limited independent movement of said connected ends and an adjustment of the jetties with relation to one another.

3. A jetty setting of the character described, including a plurality of jetties each composed of bars connected in tripod form and connected together, transverse bars arranged in substantially triangular formation and connecting the tripod bars, said jetties each having one of its transverse bars arranged in end-to-end initially approximate alignment, the ends of the aligned transverse bars being sufificiently close to each other to form substantially a continuous metallic structure throughout the jetty setting, and separate upper and lower anchoring lines connecting the jetties and arranged in substantial parallelism with the aligned transverse bars, the upper anchoring line extending through each of the jetties above each of the connections of the tripod bars and the lower anchoring line also passing through each of the jetties below the connection of the tripod bars, and means located adjacent said connections of the tripod bars on the downstream side of the jetties for connecting the anchoring lines together.

GEORGE W. REHFELD. 

